Like with Gettysburg and Antietam, I'm sure we'll release a brigade scenario pack eventually. The first scenario is brigade level which should keep you busy for a while. There's also a very unique brigade level scenario for Salem Church where you have two artillery pieces and a dismounted cavalry regiment in your brigade.

If you want to get an idea, the SDK includes probably more details than you want at this point. Also download the GB Historical Scenarios mod which lets you look at the file set that defines and controls a scenario. Don't be at all shy about questions as this does have a bit of a learning curve.